Who cares if your boy wears dresses if he is happy?
It is no different for you to teach your boy to act like a boy is supposed to than it is for say a white father to teach his white children to act like they should according to their race.
Most kids are going to be made fun of for something anyway. Gender-varient behavior is one of the things that tend to attract the most negative actions especially by peers, but isn't it a better lesson to teach your children that other people's opinions should not dictate their personal choices in life. <-that statement isn't even something I am totally comfortable. One may chose to act gender varient, but their feelings are not a choice.
No form of guidance is needed when it comes to either challenging or fitting with Gender expectations.